PVC Piping

UV resistance of PVC piping

PVC piping undergoes surface oxidation and embrittlement by exposure to sunlight over a period of time. The color of pipe
changes from gray to white. The strength of piping is not reduced, however it becomes more susceptible to impact damage.
UV protection can be provided by applying a thick coating of latex paint.

Heat tracing of PVC pipe

It is possible to heat trace PVC piping to maintain a constant elevated temperature. Electric tracing is recommended.
The maximum heat trace temperature should not exceed the pressure temperature rating of the piping system.

Pipe supports

Pipe saddle cut from PVC pipe are recommended at support locations. PVC pipe must not rest directly on steel.
Supports must be provided on or close to inline items such as valves. PVC piping connected to vibrating equipments such as
pumps must be isolated using teflon or rubber expansion joints.

Joining Methods

Solvent Welded Joints

Flanged Joints

Threaded Joints

Solvent cementing is a preferred method of joining PVC pipe and fittings. The OD of the pipe and ID of fitting are
primed, coated with special cement and joined together. Most solvent cement joints fail due to lack of solvent penetration
or inadequate primer application.